The Computrainer is by far the best winter training tool out there. Keeps things interesting during the winter.
Intervals are brutal on this thing as you program your sets and you produce 300w (or whatever) regardless of your cadence, you can't cheat (Though you can do the manual erg setting and cheat)
The 3D software is nice and lets you do rides and if someone has created a course for a specific race or ride, you can "preride" it on the computrainer. Its not as flashy as the Tacx 3d software but the computrainer software works and most courses made on the internet are for computrainer.
Also think of it as an investment. My buddy has had his unit forever and still works. I would probably sell one of my bikes before selling my computrainer.